About the Product Our hand warmers contain sodium chloride and vermiculite. It releases heat, raises body temperature, and warms your hands. Its usage is simple: 1. After opening the package, take out the patch and stick it inside your clothing. 2. The patch will start heating up within 15-30 minutes. 3. The warming effect lasts for 10 hours. It can also be used for winter activities, including outdoor excursions, warming your hands for writing, and local pain relief. Product Name: Hand Warmer Product Ingredients: Sodium Chloride, Vermiculite Keywords: Hand Warmer Weight: 475g, 41g Product Specifications: 20pcs, 2pcs Product Size: 20pcs: 15*12cm; 2pcs: 12*9cm Note: Light reflection and different monitors may cause the color of the product in the picture to be slightly different from the actual product. Minor measurement errors are allowed.